fix: Unrecognized configuration from quarkus-logging-json

[astefanutti]

This PR fixes the following warning messages, that Quarkus logs when the quarkus-logging-json extension is not present:

2021-06-28 10:13:50,787 WARN  [io.qua.config] (main) Unrecognized configuration key "quarkus.log.console.json.pretty.print" was provided; it will be ignored; verify that the dependency extension for this configuration is set or that you did not make a typo
2021-06-28 10:13:50,788 WARN  [io.qua.config] (main) Unrecognized configuration key "quarkus.log.console.json" was provided; it will be ignored; verify that the dependency extension for this configuration is set or that you did not make a typo

More generally, this PR only appends environment variables related to Quarkus logging configuration when explicitly needed or provided by the user.

Release Note

NONE